What was found
ON TAXI TO RUNWAY, ANTI-SKID FAIL CAS MSG ALONG WITH CB POP. SHORTLY AFTER, LOW BRAKE PRESS CAS MSG ILLUMINATED. UPON RETURN TO RAMP, EMER BRAKES WERE USED TO STOP ACFT. FOUND BRAKE RESERVOIR TO BE LOW BEYOND LIMITS, SERVICED RESERVOIR IAW MM 12-12-02. TAXIED ACFT, BRAKE SYS OPERATES GOOD, NO LEAKS DETECTED. INSPECTED POWER BRAKE HYD PUMP FILTER, FOUND NO EVIDENCE OF INTERNAL PUMP FAILURE. R & R FILTER. INSPECTED POWER BRAKE ACCUMULATOR, FOUND NO EVIDENCE OF INTERNAL LEAK OR FAILURE. CONDUCTED BLEED & SERVICE OF ANTI-SKID BRAKE SYS. SYS LEAK & OPERATIONS CHECKED GOOD IAW MM 32-44-00-961 & 32-44-20.